Electric-light housing



July 5,1927. C. W. DAKE ELECTRIC LIGHT HOUSING Filed 001;. 27, 1924 5 Sheets-Sheet 1 INVENTOI UkarZ S WDa/e ELECTRIC LIGHT HOUS ING Filed Oct. 27, 1924 3 Sheets-Sheet 2 INVENTOR' Patented July 5, 1927.

PATENT OFFICE.

CHARLES W. BAKE, OF CHICAGO, ILLIHOIS.

ELECTRIC-LIGHT nousme.

Application and October 27, 1924. Serial mi. 745,949.

surface without permitting the introduction of outside air. One object of my invention is to provide a light housing wherein automatic circulation of the enclosed body of air may take place when the light is operated. In this connection attention is called to my copending application of even date herewith Serial No. 745,950. Other objects of my invention will appear from time to time in the course of the specification and claims.

My invention is illustrated more or less diagrammatically in the accompanying drawings, wherein Figure 1 is a front view;

Figure 2 is a back view with parts broken away and parts in section;

Figure 3 is a section along the line 33 of Figure 1.

Like parts are indicated by like characters throughout the specification and drawings.

A is a base or bracket adapted to be fastened to a suitable support in any desired method not here shown. This base has a central boss A containing a screw A on which is a lock nut A A is a bail or bracket mounted on the boss-A and held in position by the nut and screw, A and A and a washer A.

B is a metallic housing provided with trunnion ibOSSGS B B on opposed sides adapted to engage the ends of the bail A. From these trunnions' project screws B associated with nuts B and washers B whereby thehousing may be clamped in adjusted position or made to swing as the case may be. The arrangement just described permits any desired adjustment of the axis of the beam of light and might be dispensed with if it were desired to use the light in a fixed position when other suitable means for the housing might be used.

The housing is closed by a door comprising an annular ring C, having ears C C carrying a pivot pin G in a pivot lug C on the housing and a slotted lug C engaging a screw C and thumb nut C on a lug C on the housing whereby the door may be firmly held in place and the packing ring C may be compressed to make an air tight closure. C is a translucent panel or lens provided for use in connection,

with a packing ring C and held in place in the door by means of spring clips C and holding screws C i The lower rear side of the housing B comprises 'an apertured spherical member D.

.In this 1 spherical member is mounted a threaded sleeve D having a spherical flange D adapted to engage the inner surface of the spherical member D. Threaded on the sleeve D is a lock sleeve D having a spherical flange D adapted to engage the outer surface of the member Dso that when these two sleeves are threaded one on the other and tightened up, the spherical member D is gripped between the spherical flanges D I) permitting adjusting movement of the sleex e D about a center of rotation inside the housing at the point D D is a sleeve slidable in the sleeve D and adapted to be held in longitudinal ad usted position by means of the setscrew D. This sleeve contains a socket for the electric light bulb D the current therefor passing up through the sleeve from the conductors D. By this arrangement the electric light bulb may be moved longitudinally when the set screw D is re leased and may be swung in any desired position about the point D when the sleeves are loosened.

E is a reflector support contained within the housing B. It has bridge extensions E E between it and the wall of the housing and vertically disposed. E is a reflector contained within the support E and spaced therefrom as indicated, except about its periphery where a cushion ring' E is interposed between them. E is a holding ring surrounding the periphery of the reflector supportE and held in place by the screws E and adapted to hold the reflector in place in the housing. The reflector and the housing are both ape'rtured' as indicated adjacent the pivot point D", thus making it possible to adjust the light in thereflector while still making it possible to use a very small opening through the reflector for the light socket. 1

The space between the reflector and the carried on it two extending laterally reflector housing is relatively thin and furno I ing. The result of thisis that when the light is on the air in the front part of the housing is heated and tends'to rise up and travel in the direction indicated by the arrows being cooled on its way down Where it engages the inner side of the corrugated cool housing. The dead air space at the back of the reflector protects this air against v the heat of the filament and thus there is a constant circulation of air in. the direction indicted by the arrows. There will alsobe some circulation up through the body of the reflector between the light socket and the boundary of the perforations in the reflector. Such heated air will travel out as indicated by the arrows and join with the main stream.

The result of this is that the housing can be kept rigidly air tight and there will still be a sufliciently even circulation of air to keep the reflector cool enough to prevent damage to it, owing to the force of the heat circulating air as it passes from the hot filament to the cool back of the housing.

It will be evident that while I have shown in my drawings, an operative device, still many changes might be made in,- the size, shape and disposition of parts without departing materially from the spirit of my invention and I wish, therefore, that my showing be taken as in a sense diagrammatic.

I claim:

1. An electric light case comprising an hermetically sealed housing, a reflector support mounted in and out of contact with the walls thereof, a reflector carried by but spaced from the support to provide a dead air space, an electric light source in the housing and means for cooling the wall of the housing behind the reflector support, a support for the electric light source projecting inwardly through the reflector and the reflector support, and adjustably mounted in the wall of the. housing.

2. An electriclight case com rising an hermetically sealed housing, a re ector; support mounted in and out of contact with the Walls thereof, a reflector carried by;but spaced from the support to provide a dead air space, an electric light source in the housing and means for cooling the wall of the housing behind the reflector support, a ball and socket support for the electric light source projecting in part inwardly'through the reflector and the reflector support, and

adjustably mounted in the wall of the housing, the center of rotation of the ball and socket lying adjacent the periphery of the reflector.

3. An electric light case comprising an hermetically sealed housing, a reflector support therein, horizontal bridge elements extending across the housing between the wall thereof and the reflector support, the reflector support being carried by the bridge elements and out of cont-act with the walls of the housing and enclosing between it and the reflector a dead air space, the reflector contained Within the support and out of contact therewith except at its periphery.

4;. An electric light case comprising an hermetically sealed housing, a reflector support therein, horizontal bridge elements extending across the housing between the wall thereof and the reflector support, the reflector contained within the support and out of contact therewith except at its periphery, the back wall of the housing adjacent the reflector support being corrugated for cooling.

Signed at Chicago count State of Illinois, this 23" ay of October, 1924.

of Cook and CHARLES w. BAKE; a 

